Stone hoes were used throughout eastern North America, especially by the Mississippian people. They were also used in Kansas and stemmed hoes have been found in Oklahoma. These are dirt-digging machines! They were used to cultivate corn fields, but were undoubtedly used to dig post holes and wall trenches for building houses and for digging storage and cooking pits.
This hoe is made to use. Chert (flint) hoe blade tied to a wooden handle with rawhide.

Shell hoes were also used for cultivation and digging. This shell hoe is modeled from a complete hoe found in a rock shelter in Arkansas. Made of freshwater mussel shell, wood handle and bark straps, like the original. Rawhide ties may be substituted for the bark straps.
The mussel shell hoe blades are found on archaeological sites on the Plains as well as the eastern United States.

The wooden digging stick is one of the most common digging tools of prehistoric native peoples. They were used to break new ground for farming, digging holes and digging roots and tubers for food. They have been found throughout the United States.

The bison bone tipped digging stick was used on the plains from Texas to the Dakotas, where soil can become extremely hard and wooden tipped digging sticks would be ineffective.
Archaeologist do not know if they had a right angle handle like a stone hoe or a straight handle like a digging stick. These are interpreted with a long heavy straight handle and heavy bison leg bone with enough weight for serious digging.